﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using Newtonsoft.Json;

namespace WebSite.Class
{
    public static class FtpHelper
    {
        //获取ftp上面的文件和文件夹
        public static string[] GetFileList(FtpClient client, string dir)
        {
            StringBuilder result = new StringBuilder();
            try
            {
                var request = (FtpWebRequest)WebRequest.Create(new Uri(client.Path));
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(client.UserName, client.Password); //设置用户名和密码
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                request.UseBinary = true;

                WebResponse response = request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream() ?? throw new InvalidOperationException());

                string line = reader.ReadLine();
                while (line != null)
                {
                    result.Append(line);
                    result.Append("\n");
                    Console.WriteLine(line);
                    line = reader.ReadLine();
                }

                // to remove the trailing '\n'
                result.Remove(result.ToString().LastIndexOf('\n'), 1);
                reader.Close();
                response.Close();
                return result.ToString().Split('\n');
            }
            catch (Exception ex)
            {
                Console.WriteLine("获取ftp上面的文件和文件夹：" + ex.Message);
                return null;
            }
        }

        /// <summary>
        /// 获取文件大小
        /// </summary>
        /// <param name="client"></param>
        /// <param name="file">ip服务器下的相对路径</param>
        /// <returns>文件大小</returns>
        public static int GetFileSize(FtpClient client, string file)
        {
            try
            {
                var request = (FtpWebRequest)WebRequest.Create(new Uri(client.Path + file));
                request.UseBinary = true;
                request.Credentials = new NetworkCredential(client.UserName, client.Password); //设置用户名和密码
                request.Method = WebRequestMethods.Ftp.GetFileSize;

                int dataLength = (int)request.GetResponse().ContentLength;

                return dataLength;
            }
            catch (Exception ex)
            {
                Console.WriteLine("获取文件大小出错：" + ex.Message);
                return -1;
            }
        }

        /// <summary>
        /// 文件上传
        /// </summary>
        /// <param name="client"></param>
        /// <param name="filePath">原路径（绝对路径）包括文件名</param>
        /// <param name="objPath">目标文件夹：服务器下的相对路径 不填为根目录</param>
        public static void FileUpLoad(FtpClient client, string filePath, string objPath = "")
        {
            try
            {
                string url = client.Path;
                if (objPath != "")
                    url += objPath + "/";
                try
                {
                    //待上传的文件 （全路径）
                    try
                    {
                        FileInfo fileInfo = new FileInfo(filePath);
                        using (FileStream fs = fileInfo.OpenRead())
                        {
                            var reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(url + fileInfo.Name));

                            //设置连接到FTP的帐号密码
                            reqFtp.Credentials = new NetworkCredential(client.UserName, client.Password);
                            //设置请求完成后是否保持连接
                            reqFtp.KeepAlive = false;
                            //指定执行命令
                            reqFtp.Method = WebRequestMethods.Ftp.UploadFile;
                            //指定数据传输类型
                            reqFtp.UseBinary = true;

                            using (Stream stream = reqFtp.GetRequestStream())
                            {
                                //设置缓冲大小
                                int BufferLength = 5120;
                                byte[] b = new byte[BufferLength];
                                int i;
                                while ((i = fs.Read(b, 0, BufferLength)) > 0)
                                {
                                    stream.Write(b, 0, i);
                                }

                                Console.WriteLine("上传文件成功");
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine("上传文件失败错误为" + ex.Message);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine("上传文件失败错误为" + ex.Message);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("上传文件失败错误为" + ex.Message);
            }
        }

        /// <summary>
        /// 删除文件
        /// </summary>
        /// <param name="client"></param>
        /// <param name="fileName">服务器下的相对路径 包括文件名</param>
        public static void DeleteFileName(FtpClient client, string fileName)
        {
            try
            {
                string uri = client.Path + fileName;
                FtpWebRequest reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(uri));
                // 指定数据传输类型
                reqFtp.UseBinary = true;
                // ftp用户名和密码
                reqFtp.Credentials = new NetworkCredential(client.UserName, client.Password);
                // 默认为true，连接不会被关闭
                // 在一个命令之后被执行
                reqFtp.KeepAlive = false;
                // 指定执行什么命令
                reqFtp.Method = WebRequestMethods.Ftp.DeleteFile;
                FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("删除文件出错：" + ex.Message);
            }
        }

        /// <summary>
        /// 新建目录 上一级必须先存在
        /// </summary>
        /// <param name="client"></param>
        /// <param name="dirName">服务器下的相对路径</param>
        public static void MakeDir(FtpClient client, string dirName)
        {
            try
            {
                string uri = client.Path + dirName;
                FtpWebRequest reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(uri));
                // 指定数据传输类型
                reqFtp.UseBinary = true;
                // ftp用户名和密码
                reqFtp.Credentials = new NetworkCredential(client.UserName, client.Password);
                reqFtp.Method = WebRequestMethods.Ftp.MakeDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("创建目录出错：" + ex.Message);
            }
        }

        /// <summary>
        /// 删除目录 上一级必须先存在
        /// </summary>
        /// <param name="client"></param>
        /// <param name="dirName">服务器下的相对路径</param>
        public static void DelDir(FtpClient client, string dirName)
        {
            try
            {
                string uri = client.Path + dirName;
                FtpWebRequest reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(uri));
                // ftp用户名和密码
                reqFtp.Credentials = new NetworkCredential(client.UserName, client.Password);
                reqFtp.Method = WebRequestMethods.Ftp.RemoveDirectory;
                FtpWebResponse response = (FtpWebResponse)reqFtp.GetResponse();
                response.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("删除目录出错：" + ex.Message);
            }
        }

        /// <summary>
        /// 从ftp服务器上获得文件夹列表
        /// </summary>
        /// <param name="client"></param>
        /// <param name="requedstPath">服务器下的相对路径</param>
        /// <returns></returns>
        public static List<string> GetDirctory(FtpClient client, string requedstPath)
        {
            List<string> strs = new List<string>();
            try
            {
                string uri = client.Path + requedstPath; //目标路径 path为服务器地址
                FtpWebRequest reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(uri));
                // ftp用户名和密码
                reqFtp.Credentials = new NetworkCredential(client.UserName, client.Password);
                reqFtp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                WebResponse response = reqFtp.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream() ?? throw new InvalidOperationException()); //中文文件名

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (line.Contains("<DIR>"))
                    {
                        string msg = line.Substring(line.LastIndexOf("<DIR>", StringComparison.Ordinal) + 5).Trim();
                        strs.Add(msg);
                    }

                    line = reader.ReadLine();
                }

                reader.Close();
                response.Close();
                return strs;
            }
            catch (Exception ex)
            {
                Console.WriteLine("获取目录出错：" + ex.Message);
            }

            return strs;
        }

        /// <summary>
        /// 从ftp服务器上获得文件列表
        /// </summary>
        /// <param name="client"></param>
        /// <param name="requedstPath">服务器下的相对路径</param>
        /// <returns></returns>
        public static List<string> GetFile(FtpClient client, string requedstPath)
        {
            List<string> strs = new List<string>();
            try
            {
                string uri = client.Path + requedstPath; //目标路径 path为服务器地址
                FtpWebRequest reqFtp = (FtpWebRequest)WebRequest.Create(new Uri(uri));
                // ftp用户名和密码
                reqFtp.Credentials = new NetworkCredential(client.UserName, client.Password);
                reqFtp.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
                reqFtp.KeepAlive = false;
                reqFtp.Proxy = null;
                reqFtp.Timeout = 5000;
                reqFtp.ReadWriteTimeout = 5000;
                WebResponse response = reqFtp.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream() ?? throw new InvalidOperationException()); //中文文件名

                string line = reader.ReadLine();
                while (line != null)
                {
                    if (!line.Contains("<DIR>"))
                    {
                        string msg = line.Substring(39).Trim();
                        strs.Add(msg);
                    }

                    line = reader.ReadLine();
                }

                reader.Close();
                response.Close();
                return strs;
            }
            catch (Exception ex)
            {
                Console.WriteLine("获取文件出错：" + ex.Message);
            }

            return strs;
        }
    }

    public class FtpClient
    {
        //目标路径
        [JsonProperty("path")]
        public string Path => @"ftp://" + FtpIp + "/";

        //ftp IP地址
        [JsonProperty("ftpip")]
        public string FtpIp { get; set; }

        //ftp用户名
        [JsonProperty("username")]
        public string UserName { get; set; }

        //ftp密码
        [JsonProperty("password")]
        public string Password { get; set; }
    }
}